冷连轧生产工艺的进展

介绍了现代冷连轧生产线的构成、包括酸洗、冷轧、退火、平整及镀层等工艺和方法。这些生产工艺是生产高质量带钢的重要条件。     

中高碳钢焊接技术在冷连轧中的应用

通过现场试验,对比分析了常规手弧焊工艺与先经预热后经保温的新焊接工艺在65Mn带钢冷连轧过程中的焊缝状态。结果表明:经新工艺焊接后的带钢顺利完成了3个机架的冷连轧,没有断带。将此工艺延伸至40Mn、50钢、50CrVA等中高碳带钢的生产,冷轧效果都满足要求。     

涟钢冷连轧带钢表面划痕问题的分析及对策

冷连轧带钢表面划痕问题是冷轧生产中经常遇到的技术性难题。介绍了涟钢冷连轧机高速生产过程中的带钢表面划痕现象,探讨了划痕产生的机理,并且分析了轧制速度、压下规程、工作辊、乳化液等因素对划痕的影响,采用了有效措施,成功解决了带钢表面划痕的难题。     

全连续式冷轧工艺特征分析

全连续式冷轧工艺的发展对冷轧带钢的生产带来了重大的变革。然而能形成全连续轧制的条件也是有一定限度的,本文即是结合我国引进的宝钢2030mm轧机从入口段带钢运行条件导出带长与速度的关系式,从主电机功率的利用率分析了全连轧与常规轧制的差异。     

冷连轧过程中碎浪缺陷的有限元模拟

针对某1450冷连轧机组在轧制成品厚度低于0.6 mm的冷轧板时易出现不同于常规边浪缺陷的单边碎浪及双边碎浪的问题，结合现场生产实际和某典型规格产品工艺进行了非线性有限元轧制过程金属三维形变过程数值分析。首先，根据实际情况划分轧辊单元网格，并建立了连轧有限元模型。在此基础上，完成了典型规格产品1/2轧制有限元模型分析、冷轧各道次变形区有限元分析以及整个冷轧过程带钢的有限元分析。通过建立冷连轧过程中轧辊受力、变形以及带材变形情况模型，模拟了碎浪缺陷的形成过程，并研究了轧制工艺参数对轧制过程的影响。对仿真模拟实验结果进行了分析，得到与现场实际板形相同的双边碎浪板形缺陷。     

板带冷连轧自动化系统的现状与展望

带钢冷连轧成套控制设备是冷轧生产中系统性极强、技术难度极大、精度要求极高的综合性技术,其中综合自动化控制系统是冷连轧生产控制的核心,是保证冷轧带钢产品质量和生产效率的主要控制手段。本文介绍了国内外冷连轧自动化控制技术的发展历程,分析了冷连轧基础自动化和过程自动化控制系统的重要组成与功能,并对冷连轧控制系统的发展作了展望。     

基于硬度辨识的冷连轧厚度控制模型

为了消除来料硬度波动对带钢厚度的影响,提高冷轧带钢厚度控制精度,建立了基于硬度辨识的冷连轧厚度控制模型,并在传统AGC基础上,提出了改进控制策略。离线仿真结果表明：改进的AGC与传统AGC相比,各机架出口厚度波动幅值明显减小,轧制过程更加稳定,而且板形偏差降低了5 IU。     

我国首套自主化大型冷连轧机组投产

我国第一条完全自主化的现代化1 450宽带钢冷连轧生产线于2011年3月2日一次热负荷试车成功,总建设周期不到20个月。重庆万达1 450 mm五机架全连续冷轧机组是我国第一条完全依靠自己的技术力量,     

唐钢酸洗连轧机组的自主集成与创新

介绍唐山钢铁公司冷轧薄板厂酸洗冷连轧机组联机改造概况。阐述酸洗、冷连轧的工艺特点，以及唐钢冷轧薄板厂在改造和生产过程中对酸轧机组自主创新、自主集成的某些技术，包括联机通讯、联机控制优化等内容。     

冷连轧轧辊及工艺冷却润滑

分析了钛强化冷轧工作辊的工作特性及冷连轧生产过程中工艺冷却润滑系统的组成和工作原理，介绍了新型乳化液供给和过滤系统的组成及其使用效果：     

Prospects of the Use of Synergetic Approach to Solution of Problems of the Science of Nanomaterials

A synergetic approach to solution of problems of self-controlled synthesis of nanostructures and creation of self-organizing nanotechnologies is considered in connection with the superproblem of creation of materials with functional properties resembling those of biosystems. __________ Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 55 – 61, July, 2005.     

Kinetics of the oxidation of metals — Influence of self-diffusion of metal

The importance of the self-diffusion of a metal during its oxidation by a gas is treated for the cases of nonstoichiometric oxides having either interstitial cation or cation vacancies. We have established a general relationship for the reaction rate when a mixed diffusion process occurs. From this relationship, we have shown that the pressure dependence can be different, according to whether the rate-determining process is the self-diffusion through the metal or through the product.     

胫骨生物陶瓷复合材料的微结构增韧机理

扫描电镜观察显示胫骨是一种由羟基磷灰石和胶原蛋白组成的自然生物陶瓷复合材料.羟基磷灰石具有层状的微结构并且平行于骨的表面排列.观察也显示这些羟基磷灰石层又是由许多羟基磷灰石片所组成,这些羟基磷灰石片具有长而薄的形状,也以平行的方式整齐排列.基于在胫骨中观察到的羟基磷灰石片的微结构特征,通过微结构模型分析及实验,研究了羟基磷灰石片平行排列微结构的最大拔出能.结果表明,羟基磷灰石片长而薄的形状以及平行排列方式增加了其最大拔出能,进而提高了骨的断裂韧性.     

Mechanism of Nucleation of Precipitates of Carbides of Refractory Metals Under Hot Rolling of Automotive Sheet Steel

Metal Science and Heat Treatment - The problem of formation of properties in microalloyed sheet steels is considered. The cause and the possible mechanism of precipitation of carbides of refractory...     

燃煤机组锅炉烟气脱硝灰中氨含量测定

NOx是大气环境的主要污染物之一,其主要来源为火力发电机组。依靠低氮燃烧技术,远达不到排放要求。选择性催化还原脱硝(简称SCR)技术是目前效率最高、最成熟、应用最广泛的电厂烟气脱硝技术。目前,在线氨逃逸监测技术存在诸多问题,影响了氨逃逸监测数据的准确度和稳定性。在燃料种类、炉膛结构、受热面布置、过量空气量、炉膛气流分布以及脱硝催化剂类型等条件确定的情况下,控制好氨加入量及其逃逸量是保证NOx脱除率的关键所在。燃煤锅炉除尘飞灰氨含量可侧面反映脱硝氨逃逸率的状况。根据国外的文献报道,正常情况下,电除尘灰中氨含量一般在50mg/kg-100mg/kg范围内。由于国内尚无灰中氨含量的测定方法,亦无脱硝运行对飞灰含氨量影响的数据积累。本文通过大量试验,确定了灰中氨溶解条件(如溶解时间、搅拌状态、灰水比、灰样量及其稳定性等),制定了灰中氨含量测定方法。     

Features of formation of the structure in production of blanks of disks of heat-resistant nickel alloys

Conclusions To provide a high level of mechanical properties in wrought blanks of cast ÉP741NP and ÉP962 alloys it is necessary to form controlled structures. A necklace-type structure formed in homogenizing isostatic treatment, subsequent thermomechanical working including alternation of the operations of deformation in the (+)-area and recrystallization anneals, and final heat treatment is preferable. The temperature conditions of all stages of thermomechanical working are strictly controlled, especially the final operation of deformation and heating for hardening. To eliminate hardening cracks and distortions it is necessary to use molten salts at t=600°C as quenchants. The use of multiple production operations makes it possible to significantly reduce the structural inhomogeneity related to inhertance of the original dendritic structure. However, the structure of the final semifinished product is nevertheless characterized by a difference in occurrence of the processes of polygonization and recrystallization between the former dendritic cells and the interdendritic spaces in deformation and heat treatment.To obtain structurally homogeneous blanks for gas turbine engine parts it is necessary to use basically new methods of remelting such as vacuum double electrode remelting and electron beam remelting with an intermediate vessel.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 25–29, December, 1991.     

Ab-initio calculation of enthalpies of formation of intermetallic compounds and enthalpies of mixing of solid solutions

A large number of ab-initio calculations of energies of formation of intermetallic compounds have been performed in the last 15 years. The currently used methods are listed. The paper presents a review of the aluminium based compounds which have been studied. Comparisons of calculated and experimental enthalpies of formation are provided for aluminim-3d and-4d transition metal alloys at equiatomic composition. The modelling of the enthalpies of mixing of solid solutions based on a given lattice is described.